Hoist



Oct. 16, 1945.

w. o. NELSON I no s'r 4 Sheets-Sheet 2 Filed NOV. 50, 1942 3. 3 mm 2 gm.N vm am .0 .m& m X 0 L d NM Q o H M Y: $1.9 2 0 3 -45 W 09 *0 1 m i N.mmw vmm m3 9 0 0 Q: v: t on Q2 Em mm as a o Q2 2: m a2 0 m2 Oct. 16,1945. w. o. NELSON HOIST 4 Sheets-Sheet 3 Filed Nov. 30, 1942 v dmfnior'W ZZWM Qmm 1 I @Horneu Patented Oct. 16, 1945 HOIST Walter 0. Nelson,Oslo, Minn., assignor of onehalf to HowardE. Baker, Chicago, Ill.

Application November 30, 1942, Serial No. 467,443

16 Claims.

This invention relates to a crane or hoist for hoisting and movingbodies and more particularly to a crane or hoist attachment for aportable power unit, such as a motor vehicle, a tractor, a truck and thelike.

Numerous attempts have been made to provide an attachment to a tractoror a truck, so as to convert the tractor or truck into a hoistingdevice. These attempts, as far as known, broadly consist of a hoistingmechanism superimposed upon or fixedly attached to the chassis of thetractor or truck, as-the case may be, either with or without braces orprops for supporting the hoisting mechanism when in use. In the absenceof braces or props, such hoisting devices have very definitelimitations, in that if an attempt is made to lift the bodylocated onthe side of the tractor or truck, the tractor or truck, together withthe hoisting device, will become overbalanced unless the weight of thebody and its location is such that the center of gravity is locatedabove and within the area bounded by the supporting wheels. I

The term tractor is used throughout the specification to designate anymotor vehicle such as a farm tractor, a caterpillar, a truck, anautomobile or any other motor vehicle that is adapted for use with thehoisting device shown and described.

An object of this invention is to provide a self-supporting hoistingdevice adapted to be attached or hitched to a motor vehicle, such as atractor or a truck.

Another object of this invention is to provide a hoisting device whereinthe dimensions are so proportioned that the weight of the tractor ormotor vehicle may be used as a counterpoise while hoisting.

Another object of this invention is to provide a self-supported hoistingdevice wherein the wheels of the hoisting device have a spread greaterthan the distance between the wheels of the motor vehicle.

Another object of this invention is to provide a flexible attachmentbetween the self-contained hoisting device and the motor vehicle, so asto accommodate unevenness of the ground.

Another object of this invention is to provide a pusher typeself-contained hoisting device, so that the hoisting device is locatedin front of the tractor and towed or pushed from the drawbar to the rearof the tractor.

Another object of this invention is to provide a self-contained hoistingdevice that is energized from the motor of the tractor.

' ure 1.

acter indicates the chassis of a tractor pro- Another object of thisinvention istoprovid a hoisting device having a turn-table that may belevelled.

Another object of this, invention is to provide a self-contained hoistprovided with wheels or bogies adapted to automatically align themselveswith the direction of draft.

Another object of this invention is to provide- Figure 3 is afragmentary, cross sectional view taken substantially on the line 33 ofFig- Figure 4 is a fragmentary, detail view of a portion of the devicetaken on the section line 4--4 of Figure 1. v

Figures 5 and 6 disclose top plan and. side elevational viewsrespectively of a modification. Figure '7-is an enlarged view of'thecontrol mechanism with parts shown in section.

' Referring to the drawings, the reference charvided with 'a suitablemotor I2, a pair of drive wheels l4, guiding wheels I6, which maybere'-' ferred to as the front wheels, and a conventional steering wheell8, manually controlled by the operator seated in the seat Hi. Thedetails of the tractor will not be described in their ontirety. Onlysuch portions thereof will be described as necessary to fully understandthe 0D- eration of the hoisting attachment.

The frame of the hoisting'device includes a pair of longitudinallyextendingthill-like frame members 20 and 22. The rear ends of members2!) and 22 are interconnected by an angle bar 24 attached to thedraw-bar 26 of the tractorby and 32 are held together by a pair oftrapeaoidal plates 34 and 36, one being located above and one below thetransverse frame members 30 and 32. A pair of links 40, one on eachside, fixedly attached to transverse frame member 32, are

36 are provided with apertures receiving shanks.

50 fixedly attached to forks 52 supporting suitable axles or spindles54, having journalled thereon the bogie wheels 56. The shanks 50 arefree to 34 and 36. In order to provide: properclearance lar I06 andterminating in a crank arm I08 adapted to be manually adjusted, as shownin Figure 1. Instead of a crank arm I08, a wheel I09, as shown in Figure2, may be used. The collar I06 is mounted upon a pair of supporting armsIIO, pivotally attached to brackets II2 fixedly attached to the gearring 80.

As may best be seen by referring to Figure 2, arms I10 are attached toone end ofa chain H4 hating the opposite end attached to the gear ring"80. From""this it"ca'n readily be'seen that by tightening the crank armI08 shown in Figure 1, the outer end of the boom will be raised, in that;;.the distance from the end of members [ID to the i5 rotate in theapertures in the trapeaoidalplates for the wheels, suitable spacingmembers 58 are positioned between the upper end of the forks 52 and thelower trapezoidal plate 36. This ar-' rangement -permitsthe wheels toalign themselves -with:the direction of draft.

In order to maintain proper alignment between-the tractortand the frameof the hoisting devicetthe f-rame members and 22 are interconnected tothe front end of the tractor by flexible means such as a pair-ofchains:60. One end of-oneof these-chains isconnected through ahelical-.spring-fizto the thill-like frame member 20. The oppositeendeofthis. chain 60 is connected byr-asuitable hook 64 to the front. end ofthe tractor. One endof the other chain is connectedthrough a spring 62to the thill-like frame member .22. lTheropposite end of this chain isconnected :by -a like hook-64m the forward end of the. tractor. V

The transverse supporting members and 32 have-.fixedly sattachedhthereto-a :plurality of brackets 10 supporting the flanges of the circularrace-or track 12. This .race 12 is substantially T- shapcd intransverse.-.-.cross I sectional area, the flanges of the T forming theouter ring portion andthesstemor .thewebof the T forming an in- .yvardlydirected race portion. :In addition to the brackets 10 supporting therace 12,- a pair of op- .positelydisposed brackets 14-are supported uponav transverse member 16. spanning the distance abetween the-transversemembers 30 and 32 and fixedly attached thereto.

.The: :race 12 supports an internally threaded gear ring 80thatfunctionsas a turn-table for .the ,hoisting device. This internallythreaded .gear'tring 80 is provided with a plurality of bracketsrflsupporting bevelled rollers 84 for supportingrthegearring upon the race12. These thereto a pair'of'brackets 86 having pivotally attachedthereto a pair of boom or crane members-90 joined atSZ-inanysuitablemanner, as

by rivets, bolts or welding. A pair of hooks 64,

,one on each 'side of the outer end of the boom,

supportschains 96 attached at 90 to a pair of -:arms.-or-supports 100'attached in any suitable .manner to thegear ring 80, as for example, by:brackets .IOI. These supports 500 are fixedly attached-to an internallythreaded tubular member L02 receiving ascrew I04 journalled in a colendof members I00 is shortened. This distance iimay be lengthened byunscrewin the screw I04, thereby dropping the outer end of the boom, and

vice versa As is clearly shown in Figure 2, the outer end of the boomalso supports a clamp 20, having .fixedly attached thereto the end of.acable I22 carrying a suitable sheavev I24. providedwitha hookI26,.orany other suitable.implement forattaching to the object tobehoisted-and passing over a sheave I28 rotatably mounted upon a.suit.able pintle near the. outer-end of the boom. The cable I22extends to thecenter of the device, whereit passes over asheave IZSsuppOrtedby-a chainI21 fixedly attached-between members H0. The cable I22, after leavingthe sheave I25, is wrapped around a drum I33. This drum may be driven inany suitablemannen'as will appear more fully from the description thatfollows.

In the preferred embodiment the motor of the tractor has been utilizedas. a prime'mover for actuating the hoisting device. In'theevent thehoisting device is attached to an automobile or a truck, it may be.feasible to. provide a separate primermover mountedon the hoistingdevice to drive the hoisting device throughits several movements. Suchazmotor may be a gasoline-engine or any other suitable type of engine.An electric motor may be used in the. event the hoisting device is to beusedwhere electricityis available.

A shaft I driven from the engine has mounted thereon a sprocket wheelI52driving'a chain I54 .trainedover a sprocket wheel -I 56 fixedlyattached to a stubshaft I58 journalled a suitable bearing I60. Thestubshaft I58 is connected to'a square, hollow shaft I62 through auniversal knuckle or joint I64. A square shaft? I66 has one end projecting into the square, :hollow shaft I62 and drives a universalknuckle or joint I 68 connected to a grooved pulley wheel I10 mounted ona suitable stubshaft I14 journalled in a universal bearing I12. Thisstubshaft I14 is also journalled in an eccentric bearing, not shown,adapted to be rotated in a clockwise or a counterclockwise di--rection,.scas to shift the end of the shaft I14 to theiright or to theleft, as viewed from the operator's seat shown in Figure l. The end of:the shaft I14'carries a conicalfriction drive memher I positionedbetween a pair of bevelled drivin'g-discs I82 and'l84. Thesediscs' arefixedly attached to the drum I30. When the conical drive member -I B0 ispositioned directly between the two bevelled discs, so 'as to be equallyspaced from each of the discs, it is in the neutral position and nomovement is transmitted from the engine to the drum I30. If theeccentric bearing is rotated in either a clockwise or a counterclockwisedirec tion, the end of the shaft I14 and with it the conical drivingmember 'I 80 is actuated to the right or tozthe left, as viewed from thedrivers seat, as shown in Figure lyso as to cause the conical fric tiondrive member I80 to engage the disc I82 or I84, as the case may be. Whenthe conical friction drive member I80 engages the disc I82, the drum isrotated in one direction and when it engages the disc I 84, the drum isdriven in the oppoa site direction. By this arrangement, it is possibleto drive the drum in either direction without changing the direction ofrotation of the driving mechanism supplying power fromthe engine to thebevelled disc I82 or I84, as the case may be. When the drum is rotatedso as to wind the cable upon the drum, the load is hoisted. When thedrum is driven in the opposite direction so as to unwind the cable, theload is lowered, as is well known to those skilled in the art.

The eccentric bearing, not shown, may be rotated in a clockwisedirection or a counterclockwise direction by actuating a controlmechanism including a lever I90 having forward and rearward movements.The lever I90 is pivotally attached to abracket I92 supported upon thethilllike member 20. The lever I90 is connected to a rod I 94 having oneend attached to a bell crank lever I96 having one arm attached to alever I90 connected to the eccentric bearing not shown. When the leverI90 is pushed forwardly, the eccentric bearing is rotated in onedirection from neutral position. When the lever I90 is pulledrearwardly, it actuates the eccentric bearing in the opposite direction.Instead of friction drive mechanism, suitable gear mechanism providing apositive drive could be used.

Suitable brake mechanism, not shown, may be applied to the drum, to holdthe drum in any a universal coupling unit 205 and a shaft 201 a conicaldrive member 208 mounted between a pair of bevelled discs 2I0 and 2I2fixedlyattached to a shaft 2I4 keyed to a gear or pinion 2I6, meshingwith the internally directed teeth of the gear ring 00. The eccentricbearing 209 may be rotated in clockwise or counterclockwise direction byoscillating the lever I90 to the right or to the left, as viewed fromthe drivers seat, and in a direction at right angles to the pushpulldirection described above. By oscillating the lever I90 to the right orto the left, a shaft 220 is rotated. This shaft 220 has one endnon-rotatably attached to the lever I90 and the opposite end journalledin a bearing 222 and supports a crank arm 224, having attached thereto arod 226 connected to the eccentric bearing 206. Thus, it is seen thatthe lever I90 has movements in two directions. When moving in onedirection, it controls the lift of the hoist. When moving in the otherdirection, it controls the swing of the hoist. When the eccentricbearing 206 is rotated, it raises or lowers the end of the shaft 204, soas to engage one oi the bevelled disc members 2I0 or 2 I2.

In the event a light load is to be lifted, the pulley I24 may bedispensed with and the end of the cable I22 connected directly to theload. For

heavier loads'm'ultiple sheaves orpulleys may be used, so as to multiplythe mechanical advantage.v t

A counterpoise 240, shown inxiFigure' 2;. but omitted from Figure 1 forthe purpose-of clearness, is mounted upon the supporting member 244,which is attached to the gear ring and supported thereon by a bracket242. The counterpoise 240 is diametrically disposed at all times withrespect to the load. This counterpoise has two advantages. It tends tobalance the load and it reduces the stresses placed'upon the gear ring80 and the parts associated therewith. Whenever the boom or crane ispointed ahead and aligned with the longitudinal axis of the tractor, thetractor functions as a counterpoise, glaced at the ends of the longthill-like memers.

one place to another or when it is not in use. the boom is preferablyrotated so as to be aligned with a boom supporting structure 250 mountedupon the thill-like member 22. This boom sup-. porting structureincludes a standard 252 and a diagonally disposed brace 254.

1 In Figures 5 and 6 a modification has'been shown to illustrate theadaptation of the principles described above to alight weight manuallymanipulated crane or hoist that may be powered with a light weight aircooled gasoline engine or an electric motor when electricity isavailable. may be taken apart into three separate units, each unit beinglight enough for a man to transport from one place to another.

The crane is provided with a pair of frame members 260 bent into shapefrom suitable structural steel tubing, such as round, elliptical orrectangular tubing. This structure simulates the thill-like membersdescribed above. Members 260 are telescoped into larger tubular members262 and held in place by suitable bolts 264 shown in Figure 5. An axlemember 266 is supported underneath tubular members 262 by two pairs oflong-horned-like members 268. Members 268 are welded to the tubularmembers 262. The axle 266 has journalled thereon a pair of wheels 210.The center of the axle 266 is supported upon a plurality of diagonallydisposed rods 212 underlying a platform or plate 214. The rods 212 arepreferably welded, both to the tubular members 262 and to the axle 266.In addition thereto, the rods 212 may have their extreme ends welded tothe underside of the platform 214 when this platform is made of metal.The center of the plate 214 is provided with a suitable aperturereceiving a tubular standard 216. The standard 216 is provided with apair of ears 218 welded to the top thereof. Said ears support a pintleor stubshaft 280, having journalled thereon a sheave or pulley 282. Thelower end of the standard also has attached thereto a pair of ears 294,supporting a sheave or pulley 286.

The standard 216 supports a collar 290, having pivotally attachedthereto a composite telescopically arranged boom assembly 292. Some ofthe sections of the boom assembly 292 are provided with a plurality ofapertures 294, one of which is adapted for registry with an aperture 296in the adjacent boom member so as to permit the insertion of a bolt orpin through the registering holes to hold the boom members in adjustedposition. If it is found desirable to shorten the boom or to lengthenit, it is merely necessary to When the hoisting device is transportedfrom v This modification is so designed that it remove :the m: from::the registering :apertures and adjust the vboomasection's to-.cause.the proper apertures for the desired length. to register.

"The upper end of theboom issupported by a pairs-f "chains300'adjustably attached to the standard-216. 1-A sheave1'302,. supportedin a forked member'304 attached :to the upper section ofn'the boom 292,supports a cable or rope 306, provided with a hook or any. othersuitable vvattaching means 308 forengaging the object .tobe lifted. "Thecable 306, in addition to passing over the sheave 302,'passesover thesheaves282 and 286 and is=wrapped or:wound upon a suitable drum. 3l0.'As will appear more fully later, the drum3|0 is driven in eitherdirection by agas engine 3l2.

The engine v3l2 is mounted upon asuitable platform 3l4 fixedly attachedto frame members .200. ."The platform 3l4 is providedwith a plurality oflongitudinally disposedlslots 316- permit- ;tingadjustment of the"engine .3l2 with respect to the-platform 3, to tighten the belt3'I8*driv'en by theiengine' 3l2. 'Insteadof an engine, anelectric'rnotororany other suitable prime mover could be used.

The V-belt 3;!8"drives-one ofa series-of pulleys 320 and with 'it' the;drive shaft 322 journalled insuitable bearings 324; mounted upon theframe members. 260.;1The 811511131322 supports a friction :wheel 3-2Bandat 'the eXtreme -enda series of pulleys1i328one-of which is-selectedtodrivera V-be1t 330 traveling over one of a seriesofpulleys-332-fixedly:attached'to the shaft 334 journalledrin-a pair of ;bearings336-mounted upon the frame members- 260. Theshaft 334311915 mountedthereon V a; friction wheel 338. in spaced relation from alargerifriction wheel or drum 34ll-attached to the drum 31.0" The wheels 326 :and?'338.-are aligned-with the friction drum 340, but eachnormally spaced from contact with the drum. Inorder to drive thedrum-3310, it has been mounted for adjustmentl into engagement with aselected i'friction'wheel 326 or'338, as'the case -may be. One of thesefriction wheels is used for winding the cable on the drumand theother-is used for unwinding thecable from the drum; 7 i l V The drum3l0.is mounted upon an eccentric shaft. 350 -journalled in suitablebearings, one mountedupon' each frame member 260. r When this-eccentricshaft is rotated in 'one direction, it: advances thedrum 3|0-and with itthe fricitiondrum 340.into engagement with the friction .whee1326. When:the shaft is rotated in-the opposite direction, it moves the drum 3|0and with it :the friction wheel-or drum 346-rearwardly, so as :tocausethe friotiondrum 340 to engage the friction wheel .338 so as to bedriven thereby. A lever-352 terminating'in. a collar that-is keyed tothe shaft 350 is used to oscillate the shaft 350 in either direction.

Anautomatic brake mechanism is used to hold the drum 3"! from rotationwhen the lever 352 iss-in neutral-position. This brake mechanismwillnot. be described initsentirety; but includes ardiscmember360mountedupon the shaft 350 and keyed thereto, and an idler orcam follower 362 normally seated in the notch inmember 360. This camfollower 362 is .pivotally mounted upon a movably mounted lever 334spring urged in the "down{ position by a spring 386.. As the shaft isrotated to the right, or to the left, as viewed in Figure 6, the disc360will force the cam follower 36! out of the notch inthe disc 360, whichmovement releases the brake I mechanism mounted within the drum 340.From-"thaforegoing description it can be readily'seen that as the lever352 is moved out of neutral position, it does two things. The movementof this lever automatically releases the brake and at ?'the same timeshifts the drum 340 into engagement with one of the friction wheels3200! 338. By sodoing, the drum 3l0 is rotated either .to wind the cable306 upon the drum to hoist the weight, or, if the lever is moved in theopp'csitedirectio'n,

to unwind the cable from the drum tolower .the

weight. The lever 352 is in handy reach of the operator, who may beseated upon the seat: 310 mounted upon a suitable standard 312 fixedlyattached to a base 314 .and attached to the ends of members 260. Thus,it is seen, that thethoisting device is in easy control of :theoperator; .The operator, being seated upon the seat, functions as aco-unterpoise. If the operators weightwis not suflicient, sandbags maybe placed on the base plate 314, so as to weigh down the endof thecrane.

As shown in Figures 5 and 6, the boom'is pointed ahead away from theoperator. "The boom, howevenmay be rotated'with the standard 216 ineither direction,'so as to lift the load that may be angularly disposedwith respect'to the longitudinal axis of the frame 'ofthe hoistingdevice. I

This has been accomplished by .fixedly'attaching to the standard 216 aworm gear-380.:meshing with a worm 382 rnounted-upon a'shaft-384journalled, in bearings 386', 388 and 390. rThe shaft 384 is connectedthrough a universal-joint 400 to a drive shaft 402 that may beadjustedin length and journalled on a bracket"404. The shaft 402terminates in a crank 406 withineasy reach of the operator. The operatormay oscillate the standard 216 and the boom 2-92 in either direction byrotating the crank 4-06 in the proper direction. If a rather heavy loadis tobe raised from one side or the other, it may be foundnecessary toweight the wheel opposite the boomwith sandbags, so as to provideanadequate-counterpoise. I

For some types of lift, it'may be found=;ad

vanta-geous to use a number of-sheaves toif-orma tackle block betweenthe'boom and thezload,

the operation of which is well known to those skilled in the art.

The hoisting device shown in Figures-5 and 6 may be disassembled intothree units, :each of which may be handled by one man'and; moved fromplace to place without additional help. Furthermore, the chassis-orframe-together-with the wheels,:may be used as a trailer for: lightloads, such as boats or light artillery. -.Further- -more, due tolightness of weight, the assembly may be loaded into anairplane inreadiness for use in the event of. a wreck or accident. :The trailerportion may then'be used as a trailer for gliders.

This portable hoisting device may be a used for many. kinds of work withstandardtoolsor equipment. At times itmay be necessary to designcornshocks, fuel, such as wood or coal, tanks of fuel oil, gasoline andthe like. It may be used inhandling ice and sawdust used in packing ice,inloading and unloading logs and lumber, pulp, fence posts and poles. It.may be used on the farm for handling rocks, in mines for handling oresand minerals. In drainage and highway work it may be used for handlingtiles, dirt and gravel. The hoist may be used for moving bulky materialsuch as scrap iron, cotton, cotton bales, machinery and the like. In theaircraft industry it may be used in interchanging engines and otherheavy parts. Numerous other uses for the device could be enumerated.

Although the preferred modification of the device has been described, itwill be understood that within the purview of this invention variouschanges may be made in the form, details, proportion and arrangement ofparts, the combination thereof and mode of operation, which generallystated consist in a device capable of carryingout the objects set forth,as disclosed and defined in the appended claims.

Having thus described my invention, I claim:

1. Ahoisting device adapted to be attached to a tractor, said hoistingdevice including a frame having a pair of thill-like members extendingrearwardly on either side of the tractor, means for attaching the rearends of the thill-like members to the draw-bar of the tractor, a pair ofbogie wheels for supporting the frame, said bogie wheels having agreater wheel spread than the wheel spread of the tractor, and hoistingmeans mounted on said frame, said hoisting means being located ahead ofthe tractor and including a turn-table mounted above the bogie wheels.

2. A hoisting device of the pusher type adapt ed to be attached to atractor, said hoisting device including a frame having a pair ofthilllike members extending rearwardly on either side of the tractor,means for attaching the frame to the draw-bar of the tractor, guidingmeans for attaching the frame to the front end of the tractor, saidguiding means maintaining the thill-like members in aligned relationwith the tractor, wheels mounted under the frame for supporting thesame, and hoisting means mounted on said frame positioned ahead of thetractor, said hoisting means including a turn-table mounted above thebogie wheels.

3. A hoisting device of the pusher type adapted to be attached to atractor, said hoisting device including a frame having a pair ofthilllike members extending rearwardly on either side of the tractor,means for attaching the rear ends of the thill-like members to thedraw-bar of the tractor, flexible means for attaching the thill-likemembers to the front end of the tractor, supporting wheels, means formounting the wheels under the frame, said means permitting free swingingmovement of the wheels and hoisting means mounted over the supportingwheels, said hoisting means including a turn-table.

4. A hoisting device of the pusher type adapted to be attached to atractor, said hoisting device including a frame having a pair ofthill-like members extending rearwardly on either side of the tractor,means for attaching the rear ends of thethill-like members to thedraw-bar of the tractor, flexible means for interconnecting thethill-like members to the front end of the tractor, bogie wheels mountedunder the frame, said bogie wheels being arranged in spaced relationfrom the tractor so as to support the frame, and'hoisting means mountedon said frame, said hoisting means being located on the frame ahead ofthe tractor and including a turn-table mounted above the bogie wheels.

5.A hoisting device of the pusher type adapted to be attached to atractor, said hoisting device including a frame having a pair ofthilllike members extending rearwardly on either side of the tractor,means for attaching the frame to the draw-bar of the tractor, guidinmeans for attaching the frame to the front end of the tractor, saidguiding means maintaining the thill-like members in alignedrelation'with the tractor, Wheels mounted under the frame for supportingthe same, said frame including a circular race mounted above saidwheels, hoisting means mounted upon said, race, and means for attachingthe hoisting means to the race, said means permitting angular adjustmentof the hoistmgmeans upon said race.

6. A hoisting device of the pusher type adapted to be attached to atractor, said hoisting device including a frame having a pair ofthilllike members extending rearwardly on either side of the tractor,means for attaching the frame to the draw-bar of the tractor, guidingmeans for attaching the frame to the front end of the tractor, saidguiding means maintaining the thill-like members maligned relation withthe tractor, wheels mounted under the frame for supporting the same,said frame including a circular track mounted above said wheels, andhoisting means rotatably mounted on said track, said hoisting meansincluding a boom, and means carried by the boom for supporting the bodyto' be lifted.

7. A hoisting device of the pusher, type adapt-- ed to be attached to atractor, said hoisting de- Vice including a frame having a pair ofthill-like members extending rearwardly on either side of the tractor,means for attaching the frame to the draw-bar of the tractor, guidingmeans for attaching the frame to the front end of the tractor, saidguiding means maintaining the thillhke members in aligned relation withthe tractor, wheels mounted under the frame for supporting the same,said frame including a circular track mounted above the wheels, hoistingmeans mounted for rotation upon said track, and driving means drivenfrom the engine of the tractor. for rotating the hoisting means uponsaid track.

8. A hoisting device of the pusher type adapted to be attached to atractor, said hoisting device including a frame having a pair ofthill-like members extending rearwardly on either side of the tractor,means for attaching the frame to the draw-bar of the tractor, guidingmeans for attaching the frame to the front end of the tractor, saidguiding means maintaining the thilllike members in aligned relation withthe tractor, wheels mounted under the frame for supporting the same, adrum rotatably mounted upon said frame, said frame including a circulartrack, hoisting means mounted for rotation upon the track, said hoistingmeans including a boom and a cable, said cable being attached to thedrumso that as the drum is rotated the length of the cable is adjusted,and driving means for optionally driving the drum and for oscillatingthe hoistingdevice upon the frame, said driving inean's being drivenfrom the engine of the trac- 9. A holster device of the. pusher typeadapted to be attached to a tractor, said hoisting device including aframe having a pair of thill-like members extending rearwardly on eitherside of the tractor, means for'attachingthe frame to the draw-bar of thetracton guiding means for attaching the frame to the front end of thetractor, saidguidi-ngmeans :maintaining the thill-like members inaligned-relationwith the tractor, wheels mounted under the frame forsupportingthe same, said frame including a circular track mounted abovethe wheels, hoisting means rotatably mounted upon the track, saidhoisting means including a boom and a cable, meansfor-adjusting thelength of the cable, driving means for interconnecting the engine of thetractor tothe cable adjusting means, and control means mounted upononeof the thilllike members, said control --means-being mounted withinreach of the operator of the tractor for controlling the. adjustmentofthe cab1e.-

10. A hoisting device of the pusher type adaptedto be attached to atractor, said-hoisting device including a frame having a pair ofthill-like members extending rearwardly on either side of the-tractor,means for attaching the-frame to the draw-bar of the tractor, guidingmeans for attaching the frame to the front end of the tractor, saidguiding means-maintaining the thinlike members in alignedrelation withthe tractor, wheels mounted'under the frame for supporting the same,said frame member including a circular track, ahoisting device mountedfor rotation upon the track, said'hoisting device including a boom-and'a'cable'for lifting the load, a mounted underneath the track, saidcabl'e-being attached to said drum, driving means for interconnectingthe drum and the'hoisting deivce to the engine of the tractor so thatthe engine of the tractor may be used to actuate the drum and rotate thehoisting device, and control means mounted within'reach of the operatorof the tractor for controlling the rotation of the hoisting device uponthe track and for controlling the rotation ofthe drum.

1-1. A-hoisting device of the pusher type adapted to be attached-to atractor, said hoisting device including a pair of thill-like framemembers extending rearwardly *oneon each side of the-tractor, flexiblemeans for-interconnecting said thill-like frame members to-thetractor,'a' pair --of transverse frame -members, adjustable means forinterconnecting said transverse frame members to the forward ends of thethill-li-ke' frame members, a pair of -bogie wheels, means'for attachingthe bogie wheels to the transverse frame members, a circulartrackcarried upon said transverse frame members above the bogie wheels, and ahoisting device rotatably mounted upon the track.

1 2. A hoisting deviceof the pusher type adapted oo-be attached to atractor, said hoisting-device including a pair of thill-like framemembers extending rearwardly one on each side of the tractor, flexiblemeans for interconnecting said thill-like frame members to the tractor,a pair oftransverse frame members, means for pivotallyattachingthetransverse members to the thill-likemembers, turnbuckle means forleveling :said transverse members, said turnbuckle interconnecting. thetransverse members to the thill-Iike members in spaced relation from thepivotal; mounting, .;a circular track, means for interconnecting, thecircular track to the transverse members, and hoisting means rotatablymounted upon the circular track.

,13,.. A- hoisting. device of the pusher type adapted to be attached :toa: tractor, said hoisting device including a pair of thill-like framemembers extending rearwardly oneon each sidei' of the tractor, flexiblemeans for interconnecting said thill-like frame; members tothetractor,;.a pair of transverse frame members, means for vpivotallyattaching the transversemembers to the thill-like members, turnbucklemeans for leveling said transverse members, said turnbuc'kleinterconnecting the transverse members to the thilllike members in spacedrelation from the pivotal mounting, a circular track, means for intercomnecting the circular track to thestransverse mem bers, hoisting means*rotatably mounted upon the circular track, said hoisting'rneansincluding'a boom and a cable, means for adjusting the length of thecable, and driving means for interconnecting the engine of the tractorto the cable adjusting means;

1-4; A hoisting device of the pusher type adapted to be attached to atractor, said hoisting device including a pair of thill-like framemembers extending rearwardly one on each side of the tractor, flexiblemeans for interconnecting said thill-like frame members to the tractor,a pair of transverse frame members means for pivotally attaching thetrans-verse members to the thi-ll-like members, turnbuckle means forleveling said transverse members, said turnbuckle interconnecting thetransverse members to the thilllike members-in spaced relation from thepivotal mounting, a circular track, means for interconnecting thecircular'track to the transverse-members, hoisting means rotatablymounted upon the circular track, and driving means for interconnectingtheengine to the hoisting device for rotating the hoisting devioe'on thetrack.

'15. A hoisting device of the pusher type adapted to be attached to atractor, said hoist i-ng device including a pair of thill like framemembers extending rearward-1y one on eachside of the tractor, flexiblemeans for interconnectin'g said thill-like frame members to the tractor,a pair of transverse frame members, means for pivotally attaching thetransverse members to the thill-like members, turnbuckle means forleveling said transverse members, said turnbuckle interconnecting thetransverse members to the thill-like members in-spaced relation from thepivotal mounting, a circular track, means for interconnecting thecircular track to the transverse members, hoisting means rotatablymounted upon the circular track, driving means for interconnecting theengine to the hoisting device for rotating the hoisting deviceon-*the*track, and control means within the reachof the operater forcontrolling the dr-iv-ingmeans to thereby control the rotation of thehoisting device upon said track.

16. VA hoisting device adapted to be attached to a tractor, saidhoisting device including a pair of tliill-like frame members extendingrearward-ly-one ion-each side of the'tra-ctor, flexible means forinterconnecting saidv thill-like frame members to the tractor, "bogi'ewheels mounted underneath the front end of the thill like frame membersfor supporting the same, a circular track, means for interconnecting thecircular track to the forward ends of the thilllike frame members, ahoisting device mounted upon the circular track, said hoisting devicein.- cluding a crane angularly disposed with respect to the thill-likeframemembers, and a counterpo'ise diametrically disposed with respect tothe crane so as to counterbalance-the same.

O. NELSON.

